US8833345B2 - Engine control apparatus and a method for transitioning between an all cylinder operation mode and a deactivated cylinder operation mode of a multiple cylinder internal combustion engine - Google Patents
Engine control apparatus and a method for transitioning between an all cylinder operation mode and a deactivated cylinder operation mode of a multiple cylinder internal combustion engine Download PDFInfo
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- US8833345B2 US8833345B2 US13/271,992 US201113271992A US8833345B2 US 8833345 B2 US8833345 B2 US 8833345B2 US 201113271992 A US201113271992 A US 201113271992A US 8833345 B2 US8833345 B2 US 8833345B2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/10—Introducing corrections for particular operating conditions for acceleration
- F02D41/107—Introducing corrections for particular operating conditions for acceleration and deceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
- F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/21—Control of the engine output torque during a transition between engine operation modes or states
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y02T10/123—
Definitions
- the present application relates to engine control apparatus and a method for transitioning between an all cylinder operation mode and a deactivated cylinder operation mode of a multiple cylinder internal combustion engine.
- the supply of fuel to all cylinders of an internal combustion engine may be interrupted during a mode of engine operation commonly known as deceleration fuel cut-off.
- U.S. Pat. No. 5,119,781 discloses a method of controlling engine fuel injection during transitional periods associated with deceleration fuel cut-off in order to interrupt the fuel supply to the cylinders.
- Entry into the deceleration fuel cut-off mode may be initiated when the engine is decelerating, for example when the engine control element such as the throttle valve or accelerator pedal is positioned for engine idling.
- the deceleration fuel cut-off mode of operation may be used to reduce fuel consumption and maximize engine braking induced by the drag or negative torque applied by the engine load.
- Recovery from the deceleration fuel cut-off mode may be initiated when either the engine rotational speed drops below a predetermined minimum speed net idle or the engine control element is moved from the idling position to accelerate engine rotation and increase output torque. If an engine is quickly transferred from all cylinder operation to the deceleration fuel cut-off mode or vice versa, the sudden transition in engine output torque from positive to negative or negative to positive, respectively, may result in undesirable ringing or jerking in the engine driveline.
- the output torque transients may be smoothed by gradually adjusting engine spark timing or the quantity of fuel injected into the engine during entry into and recovery from the deceleration fuel cut-off mode.
- both of these approaches have a negative impact on engine exhaust emissions because the amount of hydrocarbons present in the engine exhaust is increased.
- a method for transitioning between an all cylinder operation mode and a deactivated cylinder operation mode of a multiple cylinder internal combustion engine is provided.
- the multiple cylinders of the internal combustion engine have a firing sequence in the all cylinder operation mode.
- the method of transitioning comprises determining, when the engine operates in the all cylinder operation mode, whether or not the engine is operated under predetermined deceleration operating conditions. If the engine is operated under the predetermined deceleration operating conditions, two or more of the plurality of cylinders are individually deactivated in a deactivating sequence. The deactivating sequence is different from the firing sequence. Alternatively, or in addition, when the engine is operated in the deactivated cylinder operation mode, it is determined whether or not the engine is operated under predetermined acceleration operating conditions. If the engine is operated under predetermined acceleration operating conditions, two or more of the plurality of cylinders are individually reactivated in a reactivating sequence which is different from the firing sequence.
- multiple cylinders has the same meaning as a plurality of cylinders. Therefore, when entering into the deceleration fuel cut-off mode by transitioning between the all cylinder operation mode to the deactivated cylinder operation mode, two or more of the plurality of cylinders are deactivated in a sequence which is different from the firing sequence. This has the advantage that the first cylinder to be deactivated can be chosen arbitrarily.
- the time taken for the transition between the all cylinder operation mode and the deactivated cylinder operation mode can be reduced over a method in which the cylinders are deactivated in the firing sequence, since it is no longer necessary to wait for the first cylinder in the firing sequence to be the next cylinder due to be fired and, therefore, the first cylinder to be deactivated.
- the time taken to transition from the deceleration fuel cut-off mode, that is the deactivated cylinder operation mode to the all cylinder operation mode can be reduced over a method in which the cylinders are reactivated in the firing sequence.
- the two or more cylinders are individually deactivated by individually disabling fuelling of the respective cylinder.
- the two or more cylinders may be individually reactivated by individually re-enabling fuelling of their respective cylinder. Fuelling can be disabled and re-enabled by controlling the fuel injection valve of the respective cylinder.
- Fuelling of a progressively increasing number of the multiple cylinders is disabled in the deactivating sequence to transition the engine from the all cylinder operation mode to the deactivated cylinder operation mode.
- Fuelling of a progressively increasing number of the cylinders is re-enabled in the reactivating sequence.
- the first cylinder to be deactivated in the deactivating sequence may be determined by determining the next cylinder which is due to be fired according to the firing sequence.
- the firing sequence of an inline four cylinder engine may be 1-3-4-2. If the next cylinder due to be fired is cylinder 3 , cylinder 3 may be deactivated first rather than waiting for a period in which cylinders 3 , 4 and 2 are fired and then deactivating cylinder 1 when cylinder 1 becomes the next cylinder due to be fired and therefore the first cylinder to be deactivated.
- the second and further cylinders to be deactivated in the deactivating sequence may be determined by comparison with a look up table. This look up table comprises the allowable deactivating sequences.
- the reactivating sequence may be different from the deactivating sequence as well as different from the firing sequence. Therefore, the look up table may also comprise the allowable reactivating sequences so that the second and further cylinders to be reactivated in the reactivation sequence are determined by comparison with the look up table.
- the cylinders may be arranged in groups in the look up table.
- the groups may include pairs of cylinders that are arranged alternately in the firing sequence.
- the first group may include the cylinders 1 and 4 and the second group includes the cylinders 2 and 3 .
- the cylinders of one group may be sequentially deactivated or reactivated, respectively.
- the cylinders 1 and 4 of the first group would be sequentially deactivated before the cylinders 2 and 3 of the second group.
- any one of the cylinders may be deactivated first.
- the cylinder, which is to be deactivated or reactivated first can be determined by determining which cylinder is due to be fired next in the firing sequence. For example, if the next cylinder due to be fired is cylinder 4 , cylinder 4 can be deactivated first followed by cylinder 1 of the first group.
- the cylinders of the first group may be sequentially deactivated or reactivated in dependence of a torque ramp determined from the enable signal. For example, if the accelerating operating conditions indicate that it is desired to accelerate quickly, the order of the reactivating of the cylinders in the first group is chosen so that the reactivation of all of the cylinders occurs more quickly. If, however, it is determined that a slower acceleration is required, the order of the reactivation of the cylinders of the first group can be selected accordingly.
- the fuel is injected into the cylinder before the intake valve is opened.
- the first injection into the first cylinder after reactivation and recovery from the deceleration fuel cut off is initiated, is delivered just before intake valve closing.
- the amount of injected fuel in this first injection is increased over the normal amount of injected fuel.
- the amount of injected fuel can be increased by approximately 10 to approximately 15%.
- the predetermined deceleration and acceleration conditions may be determined from an enable signal that is generated from a clutch and/or accelerator signal. For example, a signal indicating that the accelerator pedal is not depressed indicates that deceleration is required.
- the application also provides engine control apparatus comprising means for determining whether or not the engine is operated under predetermined deceleration operating conditions or predetermined acceleration operating conditions.
- the engine control apparatus also comprises means for individually deactivating two or more of the plurality of cylinders in a deactivating sequence which is different from the firing sequence if the engine is operated under predetermined deceleration operating conditions and/or for individually reactivating two or more of the plurality of cylinders in a reactivating sequence which is different from the firing sequence if the engine is operated under predetermined acceleration conditions.
- the engine control system may further comprise a look up table comprising the allowable deactivating and reactivating sequences and/or groups of cylinders which are to be deactivated or reactivated sequentially.
- the predetermined deceleration conditions and the predetermined acceleration conditions may be determined from an enable signal.
- the engine control apparatus may further comprise means for generating a clutch engagement signal, means for generating an accelerated signal and means for generating an enable signal based on the clutch engagement signal and the accelerator signal.
- a vehicle with a multiple cylinder internal combustion engine with the engine control apparatus is also provided.
- the internal combustion engine may be a spark ignition engine.
- a computer program is also provided that comprises computer executable code for performing the method of one of the embodiments described above.
- the computer program may be stored on a data carrier such as a disk or on storage means within an engine management control unit such as a semiconductor chip.
- FIG. 1 illustrates internal combustion engine control apparatus according to an embodiment
- FIG. 2 illustrates deactivating sequences and reactivating sequences for transitioning the internal combustion engine from an all cylinder operation mode to a deactivated cylinder operation mode and vice versa.
- FIG. 1 illustrates control apparatus 1 for an internal combustion engine 19 which, in this embodiment, is illustrated as having four cylinders 2 , 3 , 4 , 5 arranged in line.
- Each of the cylinders 2 , 3 , 4 , 5 in combination with a reciprocating piston 6 provides a variable volume combustion chamber.
- the piston 6 is coupled by a rod 7 to the crankshaft 8 so that the reciprocating linear movement of the piston 6 can be translated into rotational motion by the crankshaft 8 which is used to drive a non-illustrated transmission of a non-illustrated vehicle by means of the output shaft 9 .
- Each cylinder 2 , 3 , 4 , 5 comprises an intake valve 10 , an exhaust valve 11 , a fuel injection valve 12 and a spark plug 13 .
- the internal combustion engine 19 is, in this embodiment, illustrated as a spark ignition engine.
- Each of the fuel injection valves 12 is individually operable by a first control unit 14 and each of the spark plugs 13 is individually operable by a second control unit 15 .
- the first control unit 14 and the second control unit 15 receive signals from a further control unit 16 which may be the engine management system.
- the control unit 16 such as an engine control management system, receives signals from various sensors within the vehicle, one or more of which may be used to determine deceleration or acceleration of the engine 19 , for example, clutch 17 and accelerator pedal 18 which are operated by the driver of the vehicle.
- the internal combustion engine 19 is, in this embodiment, used to drive a vehicle with a manual transmission.
- the internal combustion engine 19 may be operated in an all cylinder operation mode in which each of the four cylinders 2 , 3 , 4 , 5 is supplied with fuel by the fuel injection valve 12 and the injected fuel is ignited by means of the spark plug 13 in a conventional four stroke combustion process.
- the four cylinders 2 , 3 , 4 , 5 of the internal combustion engine 19 have a firing sequence which describes the order in which the fuel is ignited within the cylinders.
- the firing sequence conventionally gives using the numbering of the cylinders in a direction towards the output shaft.
- the cylinder designated with the reference number 2 is cylinder 1
- the cylinder designated with the reference number 3 is cylinder 2
- the cylinder designated with the reference number 4 is cylinder 3
- the cylinder designated with the reference number 5 is cylinder 4 referred to in the firing sequence.
- the firing sequence of the cylinders is 1-3-4-2. In this firing sequence, sequentially fired cylinders are spaced from one another by a turn of the crankshaft 8 due to be arrangement of the four throws of the crankshaft 8 .
- the deactivated cylinder operation mode all of the cylinders 2 , 3 , 4 , 5 are deactivated in the sense that no combustion takes place within the variable volume combustion chamber defined by the cylinders 2 , 3 , 4 , 5 and the piston 6 .
- the torque supplied to the crankshaft and output shaft is reduced until no torque is transferred from the cylinders 2 , 3 , 4 , 5 to the crankshaft 8 when all four cylinders are deactivated.
- the deactivated cylinder operation mode may be used when the vehicle is decelerating as no torque is required to be delivered to the transmission during deceleration of vehicle.
- the four cylinders 2 , 3 , 4 , 5 are deactivated or disabled by cutting off the fuel supply to the cylinders 2 , 3 , 4 , 5 .
- an increasing number of the four cylinders 2 , 3 , 4 , 5 may be progressively deactivated so that the transition from four torque producing cylinders to four torque producing cylinders, to two torque producing cylinders, one torque producing cylinder and finally no torque producing cylinder is provided.
- the transition from the all cylinder operation mode to the deactivated cylinder operation mode takes place by deactivating the cylinders in a deactivating sequence which is different from the firing sequence of the cylinders.
- the deactivating sequence is chosen so that the time taken to transition from the all cylinder operation mode to the deactivated cylinder operation mode is shorter whilst not resulting in increased engine jerk which is considered unpleasant by the driver and passengers of vehicle.
- the deactivation sequence differs from the firing sequence so that the first cylinder to be deactivated can be chosen arbitrarily.
- the internal combustion engine 19 may be operated as follows to transition the internal combustion engine 19 from the all cylinder operation mode to the deactivated cylinder operation mode.
- the engine control unit 16 receives signals from the clutch 17 and/or accelerator 18 which indicate that the vehicle should be decelerated. For example, the engine control unit 16 may receive a signal that the accelerator pedal 18 is no longer activated by the driver.
- the engine control unit 16 provides an enable signal to the first control unit 14 which controls the supply of fuel to the fuel injection valves 12 .
- the control unit 14 then cuts the fuel supply to the cylinders 2 , 3 , 4 , 5 individually in a sequence which corresponds to the deactivating sequence.
- the deactivating sequence is 1-4-3-2.
- fuel is cut off from the cylinders so that the following processes occur within the four cylinders 2 , 3 , 4 , 5 : deactivate cylinder 1 , fire cylinder 3 , deactivate cylinder 4 , fire cylinder 2 , cylinder 1 is already deactivated, deactivate cylinder 3 , cylinder 4 is already deactivated, deactivate cylinder 2 .
- All four cylinders are now deactivated so that the engine 19 is operated in the deactivated cylinder mode also known a deceleration fuel cut-off.
- the control unit 16 If the engine control unit 16 detects that it is now desired to accelerate the vehicle, for example, the accelerator pedal is pressed, the control unit 16 sends an enable signal to the first control unit 14 of the fuel injection valves 12 and the second control unit 15 which controls the spark plugs 13 and the ignition timing. Fuel is supplied to the cylinders 2 , 3 , 4 , 5 in a reactivating sequence which is different from the firing sequence and different from the deactivating sequence. After fuel is injected into the cylinder in the reactivating sequence, this fuel is ignited by control of the spark plug 13 by the second control unit 15 . In one embodiment, the reactivating sequence is 1-4-3-2 for firing sequence of 1-3-4-2.
- FIG. 2 illustrates alternative deactivating and reactivating sequences which may be used to transition between all cylinder operation mode and deactivated cylinder operation mode and vice versa. Furthermore, FIG. 2 illustrates the deactivation of four cylinders of a four cylinder inline internal combustion engine for each of the deactivating sequences and the reactivation of the four cylinders in reactivating sequences.
- D is used to denote deactivating the cylinder
- F is used to denote that the cylinder is fired and the brackets indicate that the cylinder is already in the deactivated state (D) or has already been reactivated and is in the firing state (F).
- these deactivating and reactivating sequences are stored in a look up table which may be stored in the engine management unit and/or in one or more of the first control unit and second control unit.
- a first group includes the cylinders 1 and 4 and a second group includes the cylinders 2 and 3 in the above embodiment of a four-cylinder internal combustion engine.
- the order in which the cylinders within the group are deactivated or reactivated may be selected depending on the firing order that is the cylinder which is next due to fire in the firing order. Also, the order of the deactivation or reactivation of the first group may be chosen so as to provide a higher or lower torque ramp.
- the torque ramp for deactivating sequence 1-4-3-2 is lower than that for the deactivating sequence 4-1-3-2 in which the order of the deactivating of the cylinders 1 and 4 of the first group is reversed as the number of events required before all of the cylinders are in the deactivated state is larger for the deactivating sequence 1-4-3-2.
- the amount of fuel injected into the first cylinder to fire in the reactivating sequence may be increased over the normal amount of injected fuel.
- the increase may be approximately 10% to approximately 15%, for example.
- the fuel may be injected just before the intake valve is closed rather than just before the intake valve is opened as is the case in all cylinder operation.
- the fuel injection valve control unit 14 and spark plug control unit 15 are illustrated as separate from the control unit 16 , other arrangements are possible.
- the engine control unit 16 may comprise subsystems for control of the fuel injection valves 12 and spark plugs 13 of the four cylinders 2 , 3 , 4 , 5 .
- the internal combustion engine and method of transitioning between the all cylinder operation mode and the deactivated cylinder operation mode described above can be used to reduce the time delay in transitioning from the all cylinder operation mode to the deactivated cylinder operation mode in which all of the four cylinders are deactivated and, therefore, for transitioning to the minimum possible torque without the disadvantages associated with a fixed cylinder pattern such as a fixed torque ramp and a predetermined number of events between consecutive cylinders.
- all of the possible deactivation patterns are not stored but only the so-called mandatory following pairs of cylinders 1 - 4 and 2 - 3 whilst the engine management system chooses for each pair, the cylinder which should come first.
- the engine control apparatus can also make use of the fact that at low engine loads, where recovery from the deactivated cylinder operation mode takes place, only a small amount of fuel can be injected which does not take the whole time of two engine revolutions between consecutive fuel boundaries.
- the fuel boundary represents the last time at which fuel released from the fuel injector will make it into the combustion chamber in that intake stroke.
- the first injection event can be delivered as late as possible, that is just before intake valve closing.
- the disadvantages of the potentially worse air/fuel mixture such as higher emissions, may be compensated by increasing the amount of injected fuel for the first injection by a given predetermined percentage, for example approximately 10% to approximately 15%. Besides improving combustion, this additional fuel can also serve to deplete the catalyst of stored oxygen from the preceding deactivated cylinder operation mode.
- a disadvantage of using a torque requestor to schedule deceleration fuel cut-off can be that the torque is running independently of the ignition order of the cylinders of the engine whereas, especially for fast ramps, it is often not possible to enable or disable a cylinder at the appropriate time.
- One reason is that for engines with a plurality of cylinders, only those can be deactivated that have an equal separation from each other in the ignition order in order to prevent uneven engine revolution. Additionally, the fuel that has already been injected should be ignited, i.e., a spark event will only produce torque if fuel was previously injected into the same cylinder.
- the firing order is used as the reactivating sequence, the following delay can occur.
- the generation of torque which takes place in the combustion stroke is typically less than a quarter engine revolution later than the spark delivery.
- the spark can, however, only be scheduled after decompression phase that lasts another half engine revolution. This phase is typically limited by closing the intake valve of the previous and the current cycle. This is known as the fuel boundary.
- the engine management system chooses the optimum injection timing to achieve good mixture preparation and good combustion. In many cases, a pre-injection is chosen which means that the fuel is completely injected before the intake valve opens.
- a state has to be defined for the engine management system that determines whether fuel will be injected or not and this state has to be fixed before the earliest possible start of injection, that is before the fuel boundary. If the order of activation of the cylinders is predetermined, in the worst case, it will take another two engine revolutions before the first cylinder is due according to the firing order. Therefore, in total, it will take 3 to 5 engine revolutions before a torque request can be honored. In contrast, this time delay of 3 to 5 engine revolutions can be reduced to 11 ⁇ 4 to 13 ⁇ 4 of a revolution by deactivating an arbitrary first cylinder followed by the further cylinders in a deactivating sequence which is different from the firing sequence.
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Applications Claiming Priority (2)
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GB1017431.6 | 2010-10-15 | ||
GB1017431.6A GB2484528A (en) | 2010-10-15 | 2010-10-15 | Engine control apparatus and a method for transitioning between cylinder operation of a multiple cylinder internal combustion engine |
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US20120116647A1 US20120116647A1 (en) | 2012-05-10 |
US8833345B2 true US8833345B2 (en) | 2014-09-16 |
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US13/271,992 Expired - Fee Related US8833345B2 (en) | 2010-10-15 | 2011-10-12 | Engine control apparatus and a method for transitioning between an all cylinder operation mode and a deactivated cylinder operation mode of a multiple cylinder internal combustion engine |
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Also Published As
Publication number | Publication date |
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GB201017431D0 (en) | 2010-12-01 |
CN102454493A (en) | 2012-05-16 |
GB2484528A (en) | 2012-04-18 |
US20120116647A1 (en) | 2012-05-10 |
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